ios - 迁移到 Swift 2 后出现 UIActivityViewController 错误

Question

ShareButton 功能在 Xcode 6 中有效，但在升级到 Xcode 7 后出现错误:

avc.completionWithItemsHandler = {

我的代码:

 @IBAction func ShareButton(sender: AnyObject) {

    let things = ["Thank you"]

    let avc = UIActivityViewController(activityItems:things, applicationActivities:nil)

    avc.setValue("Salon Job HK", forKey: "subject")

    avc.completionWithItemsHandler = {

        (s: String!, ok: Bool, items: [AnyObject]!, err:NSError!) -> Void in

    }

    self.presentViewController(avc, animated:true, completion:nil)

    if let pop = avc.popoverPresentationController {

        let v = sender as! UIView // sender would be the button view tapped, but could be any view

        pop.sourceView = v

        pop.sourceRect = v.bounds

    }

}

Answer 1

只需检查 Swift 2.0 UIActivityViewControllerCompletionWithItemsHandler 的声明:

typealias UIActivityViewControllerCompletionWithItemsHandler = (String?, Bool, [AnyObject]?, NSError?) -> Void

像这样尝试:

avc.completionWithItemsHandler = {

    (s: String?, ok: Bool, items: [AnyObject]?, err:NSError?) -> Void in

}

或者简单地说:

avc.completionWithItemsHandler = {
    (s, ok, items, err) in

} 

---

swift 3

@IBAction func shareButton(sender: Any) {  
    let things = ["Thank you"]
    let avc = UIActivityViewController(activityItems: things, applicationActivities: nil)
    avc.setValue("Salon Job HK", forKey: "subject")
    avc.completionWithItemsHandler = {
        (activityType, completed, returnedItems, activityError) in
        // code
    }
    present(avc, animated: true)
}